The five CRPG geochemical reference samples (BR, GA, GH, Mica‐Fe and Mica‐Mg) have been distributed as reference samples for more than twenty years. All data on trace elements in these samples available to the authors since their first reports have been compiled and evaluated. It has been possible to assign working values for more than forty elements in BR, GA, GH and Mica‐Fe and for twenty‐three elements in Mica‐Mg. The samples are expected to last for another twe